Barefoot running? Learn how the body is optimally organized to move using five essential functions and barefoot running will be the joy it should be. A new book Move to Excel explains five essential functions that underly all movement, including running. Integrating them into all your movements in any given moment, including when you run, means you will excel in any skill or activity. If you were classically a heel strike runner, the five essential functions will naturally change your movements to be a ball of the foot type runner, because that is the way the human body evolved to run.